Cut-off for telephones



(No Model.) 2 sheetsesheet 1.

E. OANN.

GUT-OEE EOE TELEPHONES.

No. 468,281. Patented Feb. 2, 1892.

(No Model.) 2 Sheets-Sheet '2.

E. GANN. GUT-OPF POR TELPPHONES.

Patented Feb. 2, 1892.

we News uns co4, mom-umm, wwwrun, n. c,

NITED STATES PATENT OFFICE.

EDWIN OANN, OF WINNIPEG, CANADA.

CUT-OFF FOR TELEPHONES.

SPECIFICATION forming part of Letters Patent No. 468,281, dated February2, 1892.

Application filed October 3, 1890. Serial No. 367,029. (No model.)

To @ZZ whom t may concern:

Be it known that I, EDWIN CANN, of the Ycity of Winnipeg, in the countyof Selkirk and Province of Manitoba, Canada, have invented certain newand useful Improvements in Cut-Offs for Telephones, of which thefollowing is a specification, reference being made to the accompanyingdrawings, in which- Figure 1 is a front View of an apparatus embodyingmy invention. Fig. 2 is a side view of the same. Fig. 3 is a side Viewof pointsupport. Figli is a side View of electro-magnet. Fig. 5 is anend view of cutoff, showing audiphone-holder. Fig. 6 is a diagramshowing the operation of my invention.

My invention relates, first7 to reducing the number of conducting-wiresby enabling a number of telephones to be attached to one circuit;secondly, to enable communication to be had between any two members ofone circuit without application to the central oflice for connection,which is only necessary Where it is desired to speak with any one onanother circuit; thirdly, to entirely cut oft all other telephones thanthe two in use, so that no co m munication can be overheard by another;fourthly, to enable a system of telephones to be arranged for a smallcommunity without a central otlice, a battery of suflicent capacitybeing all that is required; fthly, to cutting out all call-bells whentwo telephones are in communication.

The other apparatus now in general use can be employed withoutalteration beyond the necessary wire connections.

In the drawings, 1 is an electro-magnet of ordinary construction.

2 is the standard or support to the same, secured to back 18.

3 is the armature; 4.-, the support to the same, secured to back 18, asshown.

5 is a point-support and terminus of wire 1l; 6, point-support andterminus of Wire 13; 7 a, vulcanite or non-electric conductor-beamworking on center-pin 7 gwhich passes through back 18.

7G is a lever attached to 7b at the back of 18, with holder 7e fortelephone attached, as shown. l

7dn 7 d are spring-rnetal plates secured to 7.

7r is a nut holding 71 in position.

8 is the positive wire, and 9 and 9SL are continuations of positive Wire8.

91 is the negative wire; 10 and 10, call-bell circuits; 11 and 12,call-bell connecting-Wires; 13, call-bell cut-oit connecting-wire; 11and 15, telephone-wires; 14LL and 15a, continuations of 14. and 15,respectively.

16:, 1Gb, 16C, 16d, 16C, 16f, 16g, and 16h are studs secured to 18, asshown.

17 17 are platina points in 5 and 6.

18 is the board upon which the apparatus is fixed.

19 is the ordinary bell attachment.

20 is the ordinary telephone-trans1nitter; O, the battery.

Fig. 6 is a diagram showing a circuit of four telephones A B C D, towhich others may be added. A and C show the position of the cutoff whenthe telephones are not in use. B and D show the position of the cut-oftin each while the communication is going on. When the speakers havefinished, the telephone is placed on the holder 7 C, which draws thecuto into the position shown at A and C. The position of the cut-ottbeing as at A, the sender signals on the call-bell the numberrepresenting the person on the circuit to whom he desires to speak,which is answered by the receiver. The sender then moves his lever 7c tothe right or left, according to his position on the circuit, thereceiver moving his lever in the opposite direction. This places them indirect communication, the remaining telephones being neutral and are cutoff completely. Taking the diagram 6, showing the position of thecut-offs on the circuit, then the electric current starting from batteryO passes along wire 8 to studs 1Gd at station A; spring-plate 7d, stud16e, wire 9, electro-magnet 1, wire 9 to stud 16d in station B;springplate 7 1,stud 16C, Wire 15, and stud 16f to telephone by wire 15onto stud 16g by Wire 14a, plate 7, stud 16, wire 13 to point-support 6,thereby diverting the current from Wire 9 and magnet 1 allowing armature3 to spring back in contact with point 17 in support 6, carrying currentby support 4, wire 10n to stud 16a in station C; spring-plate 7 d, stud16h, wire 13, support 6, armature 3, wire 10a, stud 16 in station D;spring-plate 7 d, stud 16", wire 14 15, stud 16g, wire 1i to telephone20, wire 15,

IOO

sounded, thereby indicating to station call-ed in which direction toturn the switch, calling station turning in opposite direction,as shownat station B and D, thereby bringing their telephones into circuit andcuttingout all others and call-bells. Call-bell at station A is out outby break in circuit at stud 16a in station B. B and VC are cut out atpoint 17 in stupport, and D by break at 16h.4

I make no claim for any particular form of electro-magnet or armature;but

What I do claim, and desire to secure by Letters Patent, isn 1. Athree-wire system 'of telephone communication having a non-electricconductor bealn 7 Working on a center-pin 7b, lever 7,

with telephone-holder 7 e, spring-metal plates '7d 7d, nut 7f, and studs16, 16h, 16, 16d, 16e, 16f, 16g, and 16h, and with Wires, substantiallyas and for the purpose set forth.

2. A three-Wire system of telephone communication having a non-electricconductorbeam 7", Working on a center pin 7b, lever 7C, withtelephone-holder 7 e, spring-metal plates 7d 7d, nut 7f, and studs 16%16), 16S-16d, 16C, 16f, 16g, and 16h, with Wires, in combinationWithelectro-magnet 1, support 2, armature 3, support 4, andpoint-supports 5 and 6, With points 17 17 and wires, substantially asand for the purpose above set forth.

3. A vulcanite or non-electric conductori beam 7, center-pin 7b, lever7, spring-metal plates 7d 7d, telephone-holder 7e, nut 7f, and studs16a, 162166, 16d, 16e, 16f 16g, and 16h, in combination withelectro-magnet 1, support 2, armature 3, support 4, and point-supports 5and 6, with platina points 17 17, substantially as and for the purposespecified.

Winnipeg, Manitoba, August 29, 1890.

EDWIN CANN. Witnesses: i

JOSEPH Tiros. CARTER, JAS. PETTIGREW.

